Riga Lighthouse Latvia (Daugavgrivas)

There has been a light at the entrance to Riga on the Daugava river since 1536 and a stone tower was built in 1721.
The 1721 tower was first replaced in 1819 then in 1863 Chance Brothers of Smethwick near Birmingham supplied a 4th order optic for the new lighthouse.
This lighthouse came under attack from Russian troops in WWI in 1915 and was destroyed, a concrete replacement was built in 1921 but this was again destroyed in 1944 in WWII.
A replacement was built in 1957 and stands to this day at the end of a breakwater on the west side of the harbour.
The Chance optic was saved and is on display in the Ovisi Lighthouse Museum in Latvia.

NB! The Lighthouse Work of Sir James T. Chance (APPENDIX):
1) 4th order - 1863 - Riga - Fixed.
2) 2nd order - 1863 - Riga - Fixed and revolving
It looks like two lenses were provided. Probably one for C3529 4th order and for C3526 2nd order)

Lighthouses of Russia (Historical Essays). GUNiO MO RF edition, St. Petersburg, 2001, the authors, A.A. Komaritsin, V.I. Koryakin, V.G. Romanov.:
On May 6, 1863, the Hydrographic Department published in Pilot notes the following notice: “... The Hydrographic Department reports that instead of the Riga wooden temporary lighthouse with two lights located at the end of the Fortkamet dam, at the mouth of the Zapadnaya Dvina River, in the summer of this 1863, a new cast-iron lighthouse with lantern and apparatus of the Fresnel system of the 2nd category, which will be illuminated by September 1/13 of the same year. This new lighthouse, like the existing temporary one, will also have two lights: upper and lower. The upper fire is white, constant, with bright flashes every half a minute, and the lower fire is red and also constant, but without flashes. The height of the upper above sea level is 103 feet, and from the base 21 feet ... Upon the opening of lighting at the new Riga lighthouse, the lights of the temporary wooden lighthouse will be extinguished, and the lighthouse itself will be dismantled."